very slow web service on live server

Dear all,
I developed web services on vs 2013 c# , It works fine on my development environment , but when I deploy it live server it begin very very slow ...
And after 3 or 4 times of calling web services I got this message:

System.InvalidOperationException: Timeout expired. The timeout period elapsed prior to obtaining a connection from the pool. This may have occurred because all pooled connections were in use and max pool size was reached. at System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection) at System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory) at System.Data.SqlClient.SqlConnection.Open() at WebServiceArabDictionary.Repository.GetWordList(String SearchWord, String UserDeviceKey, String UserDeviceKeyEncrypted, Int32 iFrom, Int32 iTo) in w:\xxxxxxxxxxxxxxx\Repository.asmx.cs:line 181

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